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Influence of taper on the screw-in effect of nickel-titanium rotary files in simulated resin root canal

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¼ºÇýÁø, ÇÏÁ¤È«, ±è¼º±³,
¼Ò¼Ó »ó¼¼Á¤º¸
¼ºÇýÁø ( Sung Hye-Jin ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
ÇÏÁ¤È« ( Ha Jung-Hong ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç
±è¼º±³ ( Kim Sung-Kyo ) - °æºÏ´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úº¸Á¸Çб³½Ç

Abstract

¿¬±¸¸ñÀû: ´ÏÄÌ-ƼŸ´½ ±Ý¼ÓÀ» ±Ù°üÄ¡·á±â±¸¿¡ µµÀÔÇÔÀ¸·Î½á ±Ù°üÇü¼º°úÁ¤ÀÌ ¸Å¿ì ´Ü¼øÈ­µÇ¾ú´Ù. ±×·¯³ª ÀÌ·¯ÇÑ »õ·Î¿î ±â±¸´Â ´ÜÁ¡µµ ÇÔ²² °¡Áö°í Àִµ¥ ±× Áß Çϳª°¡ ±Ù°ü³»·Î ±â±¸°¡ »¡·Á µé¾î°¡´Â °æÇâÀÌ´Ù. º» ¿¬±¸¿¡¼­´Â ´ÏÄÌ-ƼŸ´½ Àüµ¿ÆÄÀÏÀÇ °æ»çµµ°¡ screw-in effect¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» Æò°¡ÇÏ°íÀÚ ÇÏ¿´´Ù.

¿¬±¸ Àç·á ¹× ¹æ¹ý: ÃÑ 20°³ÀÇ S-ÀÚÇü Åõ¸í·¹Áøºí·Ï (Dentsply-Maillefer) ±Ù°ü¿¡¼­ µÎ ±ºÀ¸·Î ³ª´©¾î ½ÇÇèÇÏ¿´´Âµ¥ Profile±º¿¡¼­´Â 0.02, 0.04 ±×¸®°í 0.06 °æ»çµµÀÇ Profile (Dentsply-Maillefer)°ú 0.08, 0.10 ±×¸®°í 0.12ÀÇ °æ»çµµÀÇ GT Rotary file (Dentsply-Maillefer)À» »ç¿ëÇÏ¿´°í K3±º¿¡¼­´Â °°Àº °æ»çµµÀÇ K3 file SybronEndo)À» »ç¿ëÇÏ¿´À¸¸ç, ºÐ´ç 300ȸÀüÀÇ ÀÏÁ¤ÇÑ ¼Óµµ¿¡¼­ ´ÜÀÏ pecking µ¿ÀÛÀ¸·Î ±â±¸Á¶ÀÛÀ» ÇÏ¿´´Ù. Ư¼öÇÑ ÀåÄ¡¸¦ °í¾ÈÇÏ¿´À¸¸ç ÀåÄ¡³» dynamometer¸¦ ÀÌ¿ëÇÏ¿© screw-in effect¸¦ ÃøÁ¤ÇÏ¿© one-way ANOVA·Î Åë°èó¸®ÇÏ°í Tuckey¡¯s multiple range test·Î »çÈÄ°ËÁ¤ÇÏ¿´´Ù.

°á°ú: Profile ±º¿¡¼­´Â Å« °æ»çµµÀÇ ±â±¸°¡ ´õ Å« screw-in force¸¦ ³ªÅ¸³»¾ú°í (p < 0.05), K3±º¿¡¼­´Â 0.08, 0.10. ¹× 0.12 °æ»çµµÀÇ ±â±¸°¡ 0.04 °æ»çµµÀÇ ±â±¸¿¡ ºñÇØ, 0.08 ¹× 0.12 °æ»çµµÀÇ ±â±¸°¡ 0.06 °æ»çµµÀÇ ±â±¸¿¡ ºñÇØ ´õ Å« screw-in force¸¦ ³ªÅ¸³»¾ú´Ù (p < 0.05).

°á·Ð: ±â±¸ÀÇ °æ»çµµ°¡ Ŭ¼ö·Ï screw-in force°¡ ¸¹ÀÌ ¹ß»ýÇÏ´Â °ÍÀ¸·Î »ý°¢µÇ¸ç, °æ»çµµ°¡ Å« Àüµ¿È­ÀÏÀ» »ç¿ë½Ã¿¡´Â screw-in force¸¦ ¾ïÁ¦Çϱâ À§ÇØ ´õ ¸¹Àº ÁÖÀÇ°¡ ¿ä±¸µÉ °ÍÀ¸·Î »ý°¢µÈ´Ù.

Objectives: The introduction of nickel-titanium alloy endodontic instruments has greatly simplified shaping the root canal systems. However, these new instruments have several unexpected disadvantages. One of these is tendency to screw into the canal. In this study, the influence of taper on the screw-in effect of the Ni-Ti rotary instrument were evaluated.

Materials and Methods: A total of 20 simulated root canals with an S-shaped curvature in clear resin blocks were divided into two groups. ProFile .02, .04, .06 (Dentsply-Maillefer) and GT rotary files .08, .10, .12 (Dentsply) were used in Profile group, and K3 .04, .06, .08, .10, and .12 (SybronEndo, Glendora) were used in K3 group. Files were used with a single pecking motion at a constant speed of 300 rpm. A special device was made to measure the force of screw-in effect. A dynamometer of the device recorded the screwin force during simulated canal preparation and the recorded data was stored in computer with designed software. The data were subjected to one-way ANOVA and Tukey¡¯s multiple range test for post-hoc test. p value of less than 0.05 was regarded significant.

Results: The more tapered instruments generated more screw-in forces in Profile group (p < 0.05). In K3 group, 0.08, 0.10. and 0.12 tapered instruments showed more screw-in force than 0.04 tapered one, and 0.08 and 0.12 tapered instruments showed more screw-in force than 0.06 tapered one (p < 0.05).

Conclusions: The more tapered instruments seems to produce more screw-in force. To avoid this screw-in force during instrumentation, more attention may be needed when using more tapered instruments.

Å°¿öµå

°æ»çµµ; ´ÏÄÌ-ƼŸ´½ Àüµ¿È­ÀÏ; ¸ðÇü ·¹Áø±Ù°ü
Dynamometer; Nickel-titanium rotary file; Screw-in effect; Simulated resin root canal; Taper

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